// Package config provides build-tag-switched application configuration.
// The global Config singleton is initialized at import time via init()
// and can be overridden in tests with LoadForTest().
package config

import (
	"os"
	"sync"

	"github.com/joho/godotenv"
	"github.com/rs/zerolog"
)

type Environment string

const (
	Dev  Environment = "dev"
	Prod Environment = "prod"
)

type Config struct {
	Environment Environment
	Host        string
	Port        string
	LogLevel    zerolog.Level
	AppURL      string
	DBPath      string
}

var (
	Global *Config
	once   sync.Once
)

func init() {
	once.Do(func() {
		Global = Load()
	})
}

func getEnv(key, fallback string) string {
	if val, ok := os.LookupEnv(key); ok {
		return val
	}
	return fallback
}

func loadBase() *Config {
	godotenv.Load() //nolint:errcheck // .env file is optional

	return &Config{
		Host: getEnv("HOST", "0.0.0.0"),
		Port: getEnv("PORT", "7331"),
		LogLevel: func() zerolog.Level {
			switch os.Getenv("LOG_LEVEL") {
			case "TRACE":
				return zerolog.TraceLevel
			case "DEBUG":
				return zerolog.DebugLevel
			case "INFO":
				return zerolog.InfoLevel
			case "WARN":
				return zerolog.WarnLevel
			case "ERROR":
				return zerolog.ErrorLevel
			default:
				return zerolog.InfoLevel
			}
		}(),
		AppURL: getEnv("APP_URL", "https://games.adriatica.io"),
		DBPath: getEnv("DB_PATH", "data/c4.db"),
	}
}